Unable to insert photo in invoice form

I have tried Igmur and PixelFed and still unable to post picture
using code
and any clues to help me please ??
Am using Mac OS Big Sur Ver 11.5.2
https://i.imgur.com/NC1OTLt.jpg?2”>
Its working in the Forum but not on the invoice form
Obviously I am putting <img src= in front of the http.

the link you have posted is the link to a page showing the image and not the image itself.
the correct link is https://i.imgur.com/NC1OTLt.jpeg

to get the image link in Windows, you right click the image and select Open image in new tab which reveals the link to the image or you select Copy image link. i am not sure how this works on Mac though.
image

on the other hand images appear as below on Manager version 21.9.10 Windows10 x64.
image

the image appears only in the pdf output and not when viewing within Manager or using the Print option. maybe @lubos needs to check this.